/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.runtime.operators.testutils;

import org.apache.flink.api.common.functions.FlatJoinFunction;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.api.java.tuple.Tuple4;
import org.apache.flink.util.Collector;

/**
 * Simple flat join function that joins two binary tuples and considers null cases.
 */
public class SimpleTupleJoinFunction implements FlatJoinFunction<Tuple2<String, String>, Tuple2<String, Integer>, Tuple4<String, String, String, Object>> {

	@Override
	public void join(Tuple2<String, String> first, Tuple2<String, Integer> second, Collector<Tuple4<String, String, String, Object>> out) throws Exception {
		if (first == null) {
			out.collect(new Tuple4<String, String, String, Object>(null, null, second.f0, second.f1));
		} else if (second == null) {
			out.collect(new Tuple4<String, String, String, Object>(first.f0, first.f1, null, null));
		} else {
			out.collect(new Tuple4<String, String, String, Object>(first.f0, first.f1, second.f0, second.f1));
		}
	}
}
